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Old 29th December 2012, 05:06 PM   #1
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Default ARC's decoupled EL cap Patent???

Has anyone looked at ARC's decoupled electrolytic capacitor Patent? i'm curious if anyone else has ever experimented with this sort of thing? is this just hocus pocus or is there something to this?

I cant attach a direct link but if you go to ARCDB - The Audio Research Database - The unofficial & unauthorized source for ARC information and under the ARC tab at the top there is a patent's section. scroll all the way down to the bottom and read the patent.
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Old 29th December 2012, 06:59 PM   #2
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Quote:
Originally Posted by Zero Cool View Post
is this just hocus pocus or is there something to this?
Well, no rocket science as usual, but at least no complete B*S$ either.
Here is a direct link
Patent US5036292 - Decoupled electrolytic capacitor - Google Patents

The results of doubling a large cap with a small one are well known by people familiar with these problems, but the vast majority simply continues to bypass any lytic with a 100nF, and for those, such an innovation is probably a great step forward: it is ready-made, and has the gloss of a" patented technology".

Search this forum for this kind of topic, I have posted a number of actual measurements.
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Old 29th December 2012, 10:55 PM   #3
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but i have never seen anyone use an inductor in series with each lytic like that. bypass caps i have seen plenty.
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Old 30th December 2012, 02:42 AM   #4
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the inductor is not in series with the lytic, it is shunting the electrolytic.

Looks like a basic LC resonant circuit... with a resistor to lower the Q.
Fig 3 for example.
Of course it will work only over a relatively narrow range, then it gives way to being a simple RC...

Patented, eh?

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Old 30th December 2012, 02:45 AM   #5
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no the inductor is in SERIES with the lytic. looking at the first drawing fig 12 is the lytic and figure 14 is the bypass cap
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Old 30th December 2012, 02:46 AM   #6
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"A filter capacitor network includes an inductor connected in series with an aluminum electrolytic capacitor with the inductor and aluminum electrolytic capacitor bypassed with a capacitor having relatively better high frequency performance characteristics than the aluminum electrolytic capacitor."
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Old 30th December 2012, 02:50 AM   #7
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Oh... in series with what? That's the idea for the series with an AC signal, I expect... as in an output blocking cap for a quasi complementary output stage using a single power supply polarity.

Not for the PS, I expect.

But the same idea would operate...

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Old 30th December 2012, 02:54 AM   #8
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if you look at this schematic it shows an R in parallel with the L and that network is in series with the lytic. each lytic in the filter bank gets an R/L combo and the whole bank is then bypassed.

I cant upload the url to the pic..

http://www.arcdb.ws/Patents/5036292/5036292-1.gif
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Old 30th December 2012, 06:00 AM   #9
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The patent describes how to make a very poor electrolytic capacitor by deliberately increasing the ESL (equivalent series inductance) to a ridiculous level and then bypassing the result with a film capacitor.

All hail the US patent system.
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Old 30th December 2012, 07:16 AM   #10
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I think the idea is to separate the ranges over which the electrolytic and films are bypassing the PS. As bypassing generally tends to sound unpredictable, this may not be a bad idea at all.
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